Dear mrfixit,
Mick2012 has sent the following message from SPRINKLER TALK FORUM - You Got Questions, We've Got Answers (
http://www.sprinklertalk.com/wbb):
I have a Toro Greenkeeper system with 8 zones 4 arent working, 4 work fine. Where do I start troubleshooting. I would like to give it a shot before paying for professional to fix it...